Incandescent lamp.



A. KNIGHT. INGANDESGENT LAMP. APPLICATION FILED APR.10, 1909.

R O T E V N I. L

ATTORNEY Patented Jan. 19, 1915.

WITNESSES:

VififiyM m s W.

INCANDESCENT L:

Specification of Letters Patent.

(wi l Application filed April 10, 1909. Serial IIO.

To all whom it may concern it known that I, ARTHUR S. KNIGHT, subject'of the King of Great Britain, and eresiclent of Newark, in the county of Essex and State of Neiv Jersey, have invented a new and useful improvement in lncanclcscent Lamps, 01" which the following is a specification.

My invention relates to electric ineancles- Hc cent lamps, and particularly to tubular s 'i'l maintaining it taut.

The invention consists further in the pro- 1 ion oi n specific form of tension device ll-l is adapted to be interposed between the lilanie t sections and that not only introluces the QlBSlYQd degree otresiliency into the conductor system, but also provides 2 low resistance connection between the filament sections an: serves to partially support seine. v

Figure l of the accompanying drawing is a si le vieu of a lamp embodying the present invention, and Fig. :2- is an end and sectional view of the lain on the line ll-ll of Arranged in encl to end or series relation -ithin a tubular glass casing 1, and between terminal members or caps 2 that are n ountecl upon opposite ends of the tuhuh casing, are a plurality of sections 3 ancl l of a filamentous material. such as carbon or tungsten that is adapted to become heated to incenclescence upon the passage of electric current thcrethrough. lnterposecl between the filament sections 3 and 4 and electrically and mechanicallyconnecting the same, is a tension device 5 consisting of two strips or wires 6 and 7 having reversely bent portions project laterally fro rrrthe axis of th lsnip an are arranged obliquely or at an gles with respec versely bent po engage the side support the iila trally within the c lent with the sicle the tension clerics is copper or other sr' high degree of co thereof are clir Inent sections low resistance co filament seen hut a its pli I part 7 is p or other suitable ma siliency upon two parts encl '2' cured together in twisting them siliency of the pen maintain the fila:

spring; 7 is of such; were interposen sections, the ener would he OblBClQlui sprin Woulcl lJQ-PQI for reason, the proriilecl there. tension clevice nroric high degree of conch the filament taut supports it out of of tubular casin l claim as my in:

l. in iiicanrlesc A casing. a plurality or Uri nent sranged end to curl therein, an i V silicnt ineans interoosctl hot-ween acei filament sections.

2. fin incandescent casing, a plurality n ni resilient means intei osecl between iicli c nt filament sections Ql'clbtllflillh"UOlifiQcling the same.

3. In an incandescent lamp, the combination with a casing", and a plurality of filament sections arranged cn'cl tcncntl therein,' 1 of resilient means interposed between adjacent filament sections and comprising it re: versely bent conductor otfilow resistance 4:. In an incandescent lamp, the combinathat is connected at its ends to the adjacent filament sections, anda reversely bent spring attached at its ends to the ends of the reversely bent conductor.

tion with a casing, and a plurality of filament sections arranged end to end therein, of resilient means interposed between adjacent filament s'ections and comprising a reversely bent conductor of low resistance and a reversely bent spring attached together at their ends, the reversely bent portions of the conductor and the spring being disposed at angles to each other. 5. In an incandescent lamp, the combination with a casing, and a plurality of filament sections arranged end to end therein, of resilient means interposed between adjacent filament sections and comprising a reversely bent conductor of low resistance and a revcrsely bent spring attached together at their ends. 6. In an incandescent lamp, the combinationwith a casing, and a plurality of filament sections arranged end to end therein, of resilient means interposed betweer. adjacent filament sections and comprising two members respectively of high and low conductivity both of 'which are adapted to engage the casing in order to maintain the filament sections substantially central therein.

'7. In an incandescent lamp, the combination with a casing, and a system of con- 7 ductors therein comprising a plurality of filament sections arranged end to end/and resilient means interposed between adjaicent filament sections, of means carried by the system of conductors for assisting in 1,125,eea

extremities thereby maintaining the respective filaments on either side thereof taut.

9. In-an incandescent lamp,.having a filament comprising sections, adjacent sections of which areelectrically connected by means having ends which can approach and recede relative to each other to compensate for the expansion and contraction of the filament;

the lamp comprising an element or elements whichwill permit said ends of said means to recede and cause said ends to approach whereby the expansion and contraction of the filament can be compensated for.

10. An incandescent lamp having a filament comprising sections arranged end to end, adjacent sections of which are electrically connected by means having ends which can move toward and from each other; said. lamp comprising an element which will cause said ends to move toward each other and thereby maintain the fila-' ment sections under tension.

In testimony whereof, I have hereunto ARTHUR s. KNIGHT;

Witnesses:

R. C. KARGHNER, F. H. MoSoaLEY. 

